Photographic enlarging apparatus



Oct. 28, 1941. s. JOHANSON 2,260,672

mowosmrmc ENLARGING APPARATUS Filed April 1, 1940 2 Sheets-Sheet 1 iTTOR N EY Oct. 28, 1941.

s. JOHANSON PHOTOGRAPHIC ENLARGING APPARATUS Filed April 1, 1940 2Sheets-Sheet 2 ORNEY INVENTOR Ste/7 Jba/ism BY 9 i;

HP pow Patented Oct. 28, 1941 PHOTOGRAPHIC ENLARGING APPARATUS StenJohanson, New York, N. Y., assignor to Universal Camera Corporation, NewYork, N. Y., a corporation of Delaware Application April 1, 1940, SerialNo. 327,131

15 Claims.

This invention relates generally to photographic enlarging apparatus.More particulariy, this invention relates to an improved con- .structionfor a negative carrier adapted for use adapted to frictionally engagethe standard in any selected position along the length thereoi,

by means of a screw member l of customary negative carrier of thecharacter described which shall be characterized by its simplicity ,ofoperation and design and by its novel constructional features, whichshall be relatively inexpensive to manufacture and which at the sametime shall represent an important advance in the art.

@ther objects of this invention will in part be obvious and in parthereinafter pointed out.

The invention accordinglyconsists in the features of construction,combinations of elements, and arrangement of parts which will beexemplified in the construction hereinafter described, and of which thescope of application will be indicated in the following claims.

in the accompanying drawings, in which is shown one of the variouspossible embodiments of this invention,

Fig. l is a side elevational view of a photographicenlarger embodyingthis invention;

Fig. 2 is a front elevational view thereof; Fig. 3 is an enlargedcross-sectional view taken substantially on the line 33 of Fig. 2;

Figs. 4 and 5 are cross-sectional views taken substantially along thelines 4-4 andb-S respcctively of Fig. 3;

Fig. 6 is a cross-sectional view taken substantially on the line B-6 ofFig. 4;

Fig. 7 is a cross-sectional view taken substantially on the line |--'lof Fig. 5; and

Fig. 8 is a view similar to Fig. 7 but illustrating a step in theoperation thereof.

Referring now in detail to the drawings, there is disclosed in Figs. 1and 2 a photographic enlarger 10 comprising generally a base member Iihaving mounted thereon and disposed at one .end thereof an uprightstandard l2, on which is slidably mounted a supporting arm l3, the saidarm (3 being adapted'to be adjustably moved along the standard I2. Thearm I3 is provided with a split bearing portion H, which is constructionand design. The arm i3 is adapted to support a lamp housing member l6,9. lenshousing member ii and a cooperating member 18 forming a supportfor the negative carrier.

In accordance with my invention, I have provided a negative carriershown in Figs. 3 to 8, comprising a lower plate 20 having an aperture 25and an upper plate 22 having an aperture 23. The plates 20 and 22 aremaintained in correct relationship, i. c. with the'apertures 2i and insubstantial register with each other, by means of the pairs of locatingpins 24, 25 and 2t? rigidly attached to the lower plate 2i! andprojecting up wardly therefrom and which are freely received incorresponding pairs of openings and respectively in the upper plate 22.The lower plate 29 is provided with a shallow recessed por tion 39running lengthwise thereof and is of such width as to correspond to theexposed emulsion on a film F carrying photographic images which it isdesired to enlarge. This will prevent scratching oi the emulsion whenfilm its-prop erly placed in the carrier.

It is noted that the pairs or pins 24, 25 and 28 are symmetricallypositioned on opposite sides of the recess 30 so as to serve as guidesfor the film F, and to limit its lateral displacement.

The end pairs of pins 2 5 and 25 are preferably made longer than theintermediate pairs of. pins 26, in order that they may additionallyserve as guides for properly mounting the negative carrier plates 20 and22 on the support I8 of the enlarger l0. As clearly shown in Figures 3to 5 of the drawings, the negative carrier support comprises an upperrectangular flange portion Illa which may be integral with theprojecting tubular portion or support IS. The pairs of pins 24 and 25are so spaced apart from each other longitudinally of the plates 20 and22 that they will be disposed in slidable contacting relationship withthe opposite edges I81) and [8c of the rectangular portion i8a. The saidportion No (see Figs.

22 are adapted to be inserted in the space II from the open end of saidspace in the direction of the arrow A (see Fig.4) and are slidably movedin the direction of the said arrow A until the longitudinal edges 20aand 22a of the plate 20 and 22 respectively abut the shoulders 3|. Insuch lat ter position the apertures 2| and 23 optical alignment with thelenses and the light source. To prevent lateral displacement of theplates 26 and 22 in a direction away from their proper position againstthe shoulders 3|, as shown in Figures 3'and 5, the lower plate 2| isprovided with alocking pin 30 located midway are in proper tion l8between the transverse ends thereof and adjacent the longitudinal edge20?) projecting downwardly therefrom in the opposite direction from thatof the pairs of pins 24, 25 and 28.

An inner recessed shoulder 31 is provided in the portion ill; (see Fig.3) in to which the looking pin 38 will drop due to the action of theweight of the plates 20 and 22. A transverse inclined groove 38 in thesurface of the portion Ila permits the free movement of the locking pin38 while the plates 20 and 22 are being slidably received in the space35. When the pin 38 has dropped into the recessed shoulder 37, theplates will then be looked in position. To remove the said plates 20 and22 from the necessary to raise the plate 20 a sufilcient amount towithdraw the pin 38 from its recess 31.

n In accordance with this invention the followmg means are employed fornormally maintainthe plates 20 and 22 as in Figure 7 in spacedrelationship from each other a suiiicient amount to permit the insertionand longitudinal moveoi the film F therebetween, so that the hotographicimage which it is desired to an urge may be selectively positionedbetween the spaced from aperture 2! of transversely disposed spring mem-The said members 80 and ii, made of fiat spring material, are liyw.checl to the upper plate 22 by any suitable attaching means known tothe art, such as for example the hollow rivets 42 disposed, internr; tothe ends of the members it and ll, leav 1e ends free. The springs Alland resiliently urged in a direction toward the said plate due to therivets 42. Portions 40a and tin adiacent the said free ends of themembers so and ti cent over at right angles to the plane of saidmembers, the said bent over por tions 42a and die freely projectingthrough slotted openings 45 in the plate 22. The last named bent ends aand 4 is are adapted to rest upon the lower plate 20, to thus normallyresiliently space the upper plate 22 from the lower plate 2t, as in Fig.7.

For bringing the plates 2! and 22 together, so as to clamp the film Ftherebetween in any se lected position, as shown in Fig. 8, thefollowing means are provided. a

A ring 59 surrounding the opening lid in the member i8 is resilientlymounted on the portion a by means of a plurality of spring members ll 3,4 and 6) circumferentially disposed with respect to the opening "6. Oneend of each spring ii is fixedly attached tothe ring 3| by any suitableattaching means, such as for example the rivet 53, while the other endof the said spring Si is fixedly attached to the member ..-overlie thetop surface of the plate 22 and are x space 35, it is Ila by anysuitable attaching means, such as for example the screw I4.

The said springs Bl are so arranged as to normally maintain the ring 5|spaced from, and out of contact with, the upper plate 22, as in Fig. 6.Each of the springs II is provided with a free end portion extendingfrom the rivet 52, the said free end portion being provided with anangular cammed portion 55 which projects freely upwardly through anopening 58 in the portion Illa. A cam ring 60 is rotatably mounted onthe porsurrounding the opening l8b-and is disposed on the opposite sideof the springs 5| from that of the ring ID. The said ring 60 is providedwith circumferentially spaced notched portions 6| forming cams 62therebetween. The cams 62 are so disposed with respect to the springportions 5! that upon rotational movement of the ring 50 the said cams62 will engage the said spring portions 55 to resiliently press the ring50 downwardly against the action of the springs 5| and into contact withthe plate 22. The ring 50 will thus cause the plate 22 to move towardthe plate 20 against the action of the springs 40 and II to clamp thefilm F in position.

To facilitate the rotational movement of the cam ring 60, a handle 55 isprovided, which projects freely through a slot 10 in the portion [8a.The said slot H! is of such size as to limit the rotational movement ofthe ring 60 to such an extent that when the handle is disposed as shownin Figures 1 and 4, in its extreme left position, the plates 20 and 22will be spread apart as in Fig. 7, and when the handle is rotated to theextreme right position as shown by the dotted lines 65" in Fig. 4, theplates 20 and 22 will effectively-grip the film F therebetween, as inFig. 8 and in the manner hereinbefore described. It will thus be seenthat there is provided a device in which the several objects of thisinvention are achieved, and which is well adapted to meet the conditionsof practical use.

As various possible embodiments might be made of the above invention,and as various changes might be made in the embodiments above set forth,it is to be understood that all matter herein set forth or shown in theaccompanying drawings is to be interpreted as illustrative and not in alimiting sense.

Having thus described my invention, I claim as new and desire to secureby Letters Patent:

1. In a photographic enlarging apparatus of the character described, anegative carrier comprising an upper plate, a lower plate, said plateshaving aligned film apertures and means for normally maintaining saidplates spaced apart to permit the passage therebetween of a filmnegative, said last named means comprising a pair of springs carried byone of said plates, each of said springs having widely spaced portionsthereof contacting the other of said plates to uniformly urge the saidplates apart.

2. In a photographic enlarging apparatus of the character described, anegative carrier comprising an upper plate, a lower plate, said platesbeing parallelly disposed and having aligned film apertures and meansfor normally maintaining said plates spaced apart to permit the passagetherebetween of a film negative, said last named means comprisinga pairof springs carried by one of said plates, each of said springs havingwidely spaced portions thereof contacting the other of said plates touniformly urge the said plates apart without disturbing the parallelrelationship received in corresponding apertures in the other saidplates.

3. In a photographic enlarging apparatus of the character described, anegative carrier comprising an upper plate, a lower plate, said plateshaving aligned film apertures and means for normally maintaining saidplates spaced apart to 'permit the passage therebetween of a film negainthe other of said plates to prevent relative disalignment of saidplates, said pins being disposed on opposite sides of said filmapertures to addi-' tionally serve as a guide for and to prevent lateraldisplacement of said film negative.

4. In a photographic enlarging apparatus of the character described, anegative carrier comprising an upper plate, a lower plate, said plateshaving aligned film apertures and means for normally maintaining saidplates spaced apart to permit the passage therebetween of a illmnegative, said last named means comprising a pair of springs carried byone of said plates, each of said springs having widely spaced portionsthereof contacting the other of said plates to uniformly urge the saidplates apart, projecting pins on one of said plates received incorresponding apertures in the other of said plates to prevent relativedisalignment of said plates, and means for removably supporting saidcarrier on said apparatus.

5. in a photographic enlarging apparatus of the character described, anegative carrier comprising an upper plate, a lower plate, said plateshaving aligned film apertures and means for normally maintaining saidplates spaced apart to -permit the passage therebetween of a filmnegative, said last named means comprising a pair of springs carried byone of said plates, each of said springs having widely spaced portionsthereof contacting the other of said plates to uniformly urge the saidplates apart, and means for causing said plates to move toward eachother against the action of said spring to grip the film negativetherebetween.

6. In a photographic enlarging apparatus of the character descriiced, anegative carrier comprising an upper plate, a lower plate, said plateshaving aligned film apertures and means for normally maintaining saidplates spaced apart to permit the passage therebetween or a filmnegative, said last named means comprising a spring carried by one ofsaid plates and having a portion thereof contacting the other of saidplates to urge the said plates apart. and means for causing said platesto move toward each other against the action of said spring to grip thefilm negative therebetween, said last named means comprising a supportfor said negative carrier, an annular member mounted on said support andhaving a face thereof disposed adjacent one of said plates, a cam riderassociated with said annular member, and a cam rotatably mounted on saidsupport, said cam cooperating with said cam rider whereby upon rotationof said cam said annular member will be caused to move in a directiontowards said last named plate.

7. In a photographic enlarging apparatus of the characterdescribed, anegative carrier comprising an upper plate, a lower plate, said plateshaving aligned film apertures and means for norof said plates to preventrelative disalignment of a mally maintaining said plates spaced apart topermit the passage therebetween of a film negative, said last namedmeans comprising a pair of springs carried by one of said plates, eachof said springs having widely spaced portions thereof contacting theother of said plates to uniformly urge the said plates apart, projectingpins on one of said plates received in corresponding apertures in theother of said plates to prevent disallgmnent of said plates, said pinsbeing disposed on opposite sides of said film apertures to additionallyserve as a guide for and to prevent lateral dis placement of said filmnegative, and means for causing said plates to move toward each otheragainst the action of said spring to grip the film negativetherebetween. Y

8. In a photographic enlarging apparatus of the character described, anegative carrier comprisng an upper plate, a lower plate, said plateshaving aligned film apertures and means for normally maintaining saidplates spaced apart to 'permit the passage therebetween of a filmnegative, said last named means comprising a spring carried by one ofsaid plates and having a portion thereof contacting the other of saidplates to urge the said plates apart, projecting pins on one of saidplates received in corresponding apertures in the other of said platesto prevent relative disalignment of said plates, and means for remov- 9.In a photographic enlarging apparatus of the character described, anegative carrier comprising an upper plate, "a lower plate, said plateshaving aligned tllm apertures and means for normally maintaining saidplates spaced apart to perrnit the passage therebetween of a filmnegative, said last named means comprising a spring car ,ried by one ofsaid plates and having a portion thereof contacting the other of saidplates to urge the said plates apart, projecting pins on one of saidplates received in corresponding apertures in the other of said platesto prevent relative disalignment of said plates, and means for removablysupporting said carrier on said apparatus, said last named meanscomprising a case, a standard on said base, an arm slidable on saidstandard, said arm be ng provided with a support portion having aslotted opening into which said carrier plates are slidably received,said support portion having means associated therewith for urging saidplates together against the action of said spring, said projecting pinsbeing adapted to cooperate with said support portion to' additionallyserve as a means for preventing displacement of said plates in onedirection.

10. In a photographic enlarg ng apparatus of the character described, anegative carrier comprising an upper plate, a lower plate, said plateshaving aligned mm apertures and means for normally maintaining saidplates spaced apart to permit the passage therebetween of a filmnegative, said last named means comprising a spring carried by one ofsaid plates and having a portion thereof contacting the other of saidplates to urge the said plates apart, projecting pins on one of saidplates received in corresponding apertures in the other of said platesto prevent relative I the disalignment of said disalignment of saidplates, and means for removably supporting said carrier-on saidapparatus, said last named means comprising a 'base, a standard on saidbase, an arm slidable on said standard, said arm being provided with asupport portion having a slotted opening into which said carrier platesare slidably received, said support portion having means associatedtherewith for urging said plates together against the action of saidspring, said projecting pins being adapted to cooperate with saidsupport portion to additionally serve as a means for preventingdisplacement of said plates in one direction, and means for preventingdisplacement oi said plates in a direction at right angles to saidfirst'named direction.

11. In the character described, a negative carrier comprising an upperplate, a, lower plate, said plates having aligned film apertures andmeans for normally maintaining said plates spaced apart to permit thepassage therebetween oi a film negative, said last named meanscomprising a spring carried by one of said plates and having a portionthereof contacting the other of said plates to urge the said platesapart, projecting pins on one oi said plates received in correspondingapertures in t ie other ofsaid plates to prevent relative disalignrnentof said plates, and means for removahlv supporting said carrier on saidapparatus, said last named means comprising a a standard on said base,an arm slidable on standard, said arm being provided with a supportportion having a slotted opening into which said carrier plates areslidably received, support port-ion having means associated t. for uigmgsaid plates together against etc on of said spring, said projecting pins3 adapt o cooperate with said support poi-=- ztionally serve as a meansfor presplacemant oi said plates in one direcmenr for preventingdisplacement tip enlarging apparatus of a negative carrier complate, alower plate, said plates c, flips apertures and means for nor- 'saidplates spaced apart to therehetween of a film negaerned means comprisinga spring oar" ed one of said plates and having a. portion ti -ofcontacting the other of said plates to urge the mid plates apart,projecting pins on one said plates received in corresponding aperturesin the otherof said plates to prevent relaplates, and means forremovahly supporting said carrier on said appara-- tus, said last namedmeans comprising a base, a standard on said base, an arm slidable onsaid standard, said arm being provided with a support portion having aslotted opening into which said carrier plates are slidably received,said support portion having means associated therewith for urging saidplates together against the action of said spring, said projecting pinsbeing adapted to cooperate with said support portion to additionallyserve as a means for preventing displacement 01' said plates in onedireca photographic enlarging apparatus of tion, and means forpreventing displacement of said plates in a direction at right angles tosaid first named direction, said last named means comprising alockingprojection on one or said plates adapted to be received in a recessedshoulder in said support portion, said locking pin projecting in adirection opposed to that or said first named projecting pins and on theother of said plates from that of said projecting pins.

13. In a photographic enlarging apparatus of the character described, anegative carrier comprising an upper plate, a lower plate, said plateshaving aligned film apertures and means for normally maintaining saidplates spaced apart to permit the passage therebetween 01' a filmnegative, said last named means comprising a spring carried by one ofsaid plates and having a portion thereof contacting the other of saidplates to urge the said plates. apart, projecting pins on one of saidplates received in corresponding apertures in the other of said platesto prevent relative disalignment of said plates, and means for removablysupporting said carrier on said apparatus, said last named meanscomprising a base, a standard on said base, an arm slidable on saidstandard, -said arm being provided with a support portion having aslotted opening into which said carrier plates are slidahly received,said support portion having means associated therewith for urging saidplates together against the action of said spring, said projecting pinsbeing adapted o cooperate with said support portion to additionallyserve as a means for preopenings in said upper plate, said ventingdisplacement 01' said plates in one direction, and means for preventingdisplacement 0! said plates in a direction at right angles to said firstnamed direction, said last named means omprising a locking projection onone of said plates adapted to be received in a recessed shoulder in saidsupport portion, said locking pin projecting in a direction opposed tothat of said first named projecting pins and on the other of said platesfrom that of said projecting pins, and a groove in said support portionleading to said recessed shoulder to facilitate the positioning of saidplates in said slotted ope 14. In a photographic enlarging apparatus ofthe character described, a negative carrier com prising an upper plate,a lower plate, said plates having aligned film apertures, pairs of pinson said lower plate and projecting upwardly there from, correspondingpairs of apertures in said upper plate freely receiving said pinstherein to limit relative displacement of said plates, and means fornormally maintaining said plates spaced apart to permit the tree passagetherebetween of a film negative, said last named means comprising a pairof springs fixedly attached intermediate their ends to said upper plate,the said ends 01 said springs being free and angularly bent in adirection toward said lower plate, slotted bent spring ends freelypassing through said slotted openings to abut against said lower plate.

15. A photographic enlarging apparatus according to claim 14, in whichmeans are provided to cause said plates to move toward each otheragainst the action of said springs to frictionally grip the filmnegative therebetween.

' STEN JOHANSON.

